Anyone done this for an old (e.g. 1st gen) iphone for which they don't currently have a SIM? My 1st gen is sitting in a drawer with no sim in it since I upgraded to the 3GS, so I can't really fill in the form on the website since the only O2 number I have is the one currently in use with my 3GS and I won't be eligible to unlock that: also, my 1st gen phone won't be associated with that account any more (I think).